【題目】They have to work at once, _______?

A. can they B. can’t they C. don’t they D. haven’t they

【答案】C

【解析】句意:他們必須馬上工作,不是嗎?反義疑問句,前面是肯定句,后面是否定形式,have to

是一般現(xiàn)在時,用助動詞don’t。故此處為don’t they,故選C。

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